Method of making curved metal sections



Jan. 12, 1932, F. E. KLlNCi METHOD OF MAKING CURVED METAL SECTIONSFiled'oct. 8, 1929 gwuemtoz Bed 1. Klin g,

Patented Jan. 12, 1932 UNITED srA'Tns PATENT OFFICE a A rnnn E. VKLING,or Yovnesrown, orno METHOD OF CUBVED METAL SECTIONS Application filedOctober a, 1929. Serial No. 398,248.

by bending rolled or'drawn sections. However, in the case of elbowshaving a short radius this practice is impracticable because the portionof the pipe on the inside of the bend will buckle and the wall on theoutside or the bend will stretch, thereby reducing the thickness of themetal and rendering imminent the possibility of rupture.

Accordingly, a primary ob ect of the present invention is to depa-rtfromthe practice above indicated and provide curved tubular sections by awelding method. In that way the sections may be made of rolled steel witits consequent advantages not only from an economical stand oint, butalso provide 0 curved sections 0? increased strength and durability.

Any convenient and practical form o f apparatus may be used to carry themethod into efiect but by way of illustrating the novel 5 steps of themethod involved herein reference may be made to the accompanymgdrawings, in which 1 t Figure 1 illustrates perspective views of.

a pair of blanks arranged to form the curved section. 1

Figure 2 is a perspective view of the flat rectangular strips of Fig. 1curved transversely in accordance with the second step 5 of theinvention.

' Figure 3 shows the pipe sections of Fig. 2

curved longitudinally and ready for matched 1 assembly.

60 elbow, the sections being welded together.

been

Figure 5 is an end elevation of the completed elbow shown in Fig. 4.

Figures 6, 7 and 8 are detail side elevatlons respectively of 30, and180 hol- 1 low sectionsmade in accordance with the 'present invention.

Similar reference characters designate corresp onding parts throughoutthe several figures ofthe drawings.

In carrying the invention into effect it is proposed to utilize flatrectangular strips or ars desi ated in Fig. 1 as A and A which are firstnt transversely into the semi-circular cross-sectional formationindicated at B and B in Fig. 2.

\ In accordance with the next step of the method the transversely curvedsections B and B are then bent or curved longitudinally into the formshown at C and C in Fig. 3.

That is to say, after the flat rectangular strips or bars have beencurved transversely, one of them, for example, G, is bent to the properradius to form the outside of the pipe and the member C is bent on theproper radius in the direction of its longitudinal axis to form I theinside member of the hollow tubular section. As will be observed fromFigs. 2 and 3 the side edgeportion of the two sections are preferablybevelled .in opposite directions as indicated at w and 17 to provide achannel 3/ so (Figvs, 4 and 5) to receive welding material Thus, whenthe parts are assembled as shown in Fig. 4 and welded together by an ofthe well known welding methods the ho ow tubular section of Fig. 5 isprovided.

, Clearly sections of any length or radius. may be made as will beapparent from Figs.

6, 7 and 8 of the drawings.

While the drawings illustrate one form of procedure in carrying out themethod, never- V theless, it will be understood that-the flatrectangular strip A may be provided with its transverse curvature andthen the said strip A cut into lengths such as B and B for example,

according to whether the length of material I is necessary for theinside or outside radius of the elbow. That is to say, the flatrectangular strip may be rolled in len hs into its trans- Figure 4 1s aview of the completely formed forming lengths after which the latterlengths versely curved form and t en cut into elbow 2 a v 1,a4o,om

ma be bent longitudinally to the desired ra 1us.

' Without further description it is thought that the features andadvantages of the 1n- 6 vention will be readily apparent to thoseskilled in the art, and it Will of course be understood that changes inthe form, proportion and minor details of construction may be resortedto, without departing from 10 the spirit of the invention and scope ofthe I appended claims.

. I claim 1. A method of making hollow curved metallic sections fromflat strip stock which con- 15 sists in shaping two metallic blanksfirst transversely and then longitudinally to a desired radius,assembling said sections with their curved portions facing each otherand then connecting the edges of said sections by 2 a welded joint.

2. A method of making hollow curved metallic sectionsfrom fiat stripstock which consists in first subjecting flat rectangular rolled metalstrips to a bending operation 25 which shapes them into trough forms,then bending said troughed sections to form the inside and outside of acurved hollow section of the desired radius, and subsequently unitingthe meeting edges of said sections to form 3 the completed article.

. 3. A method of making elbows and the like from flat strip stock whichconsists in bending a flat rectangular strip into transversely curvedformation, then cutting the same into 5 sections of the proper length toform complemental elbow forming sections, then bendmg said complementalsections in the direction of their length to the desired radius, andsubsequently uniting the meeting edges of l said transversely andlongitudinally curved sections by a welding operation.

4. A method of making elbows and the like which consists inpreliminarily forming pieces of fiat strip stock material transversely 4into troughed formation, bending said pieces of material longitudinallyaccording to the desired radius of vthe elbow, then assembling theformed and bent pieces whereby the meetin edges occur at the sides ofthe elbow,

' 5 and su sequently welding the sections at the meeting side edges.

In testimony whereof I hereunto afiix my signature.

- FRED E. KLING.

